Diego Maradona Sinagra, often known as Diego Junior, is expected to arrive next week in Argentina.
El Porvenir coach Luis Ventura said the paperwork is being completed.
Diego Junior was born in Italy in 1986, the offspring of a relationship Maradona had with an Italian woman, Cristina Sinagra, while he was playing with Italian club Napoli.
“I love Argentine football, and to play there, is something I”ve wished to do,” Diego Junior told the Argentine sports daily Ole.
Diego Junior has had little contact with his father and is nowhere near as talented as him, with his career limited to lower-level clubs in Italy, Sport24 reports.